Furnace for bluing tacks



(No Model.)

0. P. WEAVER.

. FURNACE FOR BLUING TAGKS. No. 313,698. Patented Mar. 10, 1885.

F dJ.

A 'E n 11 i i A flatten STATES ATENT @rricn.

CHARLES P. WEAVER, OF NORRISTOW'N, PENNSYLVANIA.

FURNACE FOR BLUING TACKS.

.SPECIPICATION forming part of Letters Patent NO. 313,698, dated March10, 1885.

(No model.)

To all whom it may concern:

Be it known that 1, CHARLES P. WEAVER,

a citizen of the United States, and a resident.

of Norristown, Montgomery county, Pennsylvania, have invented certainImprovements in Furnaces for Bluing Tacks, &c., of which the followingis a specification.

My invention consists of an improved construction of furnace, moreespecially designed for the bluing of tacks, nails, and other metalarticles, as more fully described hereinafter.

In the accompanying drawings, Figure 1 is a sectional plan view of myimproved furnace. Fig. 2 is a vertical section on the line 1 2, andFigs. 3 and 4enlarged detached views of a portion of the improvement.

I prefer to construct the body A of the furnace of the cylindrical formshown in Fig. 1, the structure being built of brick with metalsheathing, as is common in metallurgic furnaces. The crown or roof A ofthe furnace incloses the large circular chamber B,through whichcirculate the products of combustion from one or more fireplaces, F, twobeing shown in the present instance, arranged at right angles to eachother. Opposite each fireplace is a fire-door, f, and below thefiregrate the usual ash-pit, 1). Besides the fire doorsf, I provide on alevel therewith in the sides of the furnace one or more openings, f f,through which the pans containing the tacks or other articles may beintroduced and withdrawn. The fire-doors f may, if desired, also be usedfor the same purpose. The products of combustion make their exit througha down-flue, D, (shown by dotted lines in Fig. 2,) and thence to thechimney. In the center of the furnace is a vertical hollow shaft, E,mounted in a step-bearing, e, 011 the founda tion, and passing upwardthrough the crown of the furnace, where it is provided with a freeworm-wheel, w, gearing into a worm, w, on a suitable horizontaldrivingshaft, S.

Engaged with the shaftE is a sliding clutch, G, by moving which intogear with the wheel to a rotary motion may be imparted to the shaft Efrom the driving-shaft S.

To the vertical shaft E is secured the horizontal table M, within thecombustion-chamber B. This table consists of a series of arms, m-eightin the present instance-radiating from acentral hub, and each having adetach able extension, on, and between and on each adjacent part ofthese extensions is fitted and rests a segmental grating, 41, allthesesegments forming together a complete annular grating as part of the opentable M, which rotates with the shaft E.

The construction of the joint by which the extensions m are fitted tothe arms on is illustrated in the enlarged detached views, Figs. 3 and4. Each extension-piece m has forked jaws 1 1, which embrace the rib ofthe arm m, and bear on the under side of the flanges 3 3, and rest onthe T-head 2 of the arm. I pre fer to make the table of detachablepieces in this way, which can be easily replaced in case of breakage,and which permit the fire-places and the bottom of thecombustion-chamber to be readily got at whenever desired. Asv I havesaid, the shaft E is hollow and closed at the lower end, and projectingdownward into it is a water-supply pipe, t, which, as shown by dottedlines in Fig. 2, extends nearly to the bottom, while at the upper end,outside the furnace, is an outlet-cock r, from which the water can flowinto an annular pan, 0,

with a waste-pipe, q.

Nhen the furnace is in operation for the bluing of tacks, and the fireshave been lighted, a slow rotary motion is imparted to the table ute,and shallow pans carrying the tacks are introduced through any of thedoors forf, and placed on the annular grating of the table, as shown inthe drawings.

The products of combustion impinge directly on the tacks in the pans,all the tacks being uniformly blued.

As the contents of each pan become blued, the latter is withdrawn andreplaced by a new one without stopping the apparatus.

I claim as my invention- 1. Thecombinationofafurnacehavingopenings inthe side walls of the combustion-chamber, a vertical rotating shaftcarrying a horizontal table within the said combustion-chamber, panssupported on the table and removable through said openings, and afire-place below the table, all substantially as set forth.

2. The combination of the fire-place and combustion-chamber of a furnacewith an open rotary table built up of detachable sections.

3. The combination of the furnace with a M at the rate of about onerevolution a min rotary table consisting of radial arms, exten- Intestimony whereoflhave signed my name sion-pieces m, and segmentalgratings n, suptothis specification in the presence of two subportedthereon. scribing Witnesses.

4. The combination of the furnace with vertical hollow shaft, inlet-pipet, outlet 1', re- Witnesses: ceiving-pan, and waste-pipe, substantiallyas JOHN E. PARKER,

0. VP. WEAVER.

set forth. HARRY SMITH.

